Dielectric elastomer sensors show great potential for wearable electronics and mechatronic applications. However, these sensors have some deficiencies in their appearance and low sensitivity to compressive force measurements. We demonstrate a novel dielectric elastomer sensor enabled by ionic liquid that has fully transparent appearance, low resistivity and the capacity of actuation at large-scale frequencies. We investigate the basic mechanical behaviors of the sensor experimentally. It is noted that the sensor has a remarkable sensitivity to measure compressive force, which is higher than the existing stacked dielectric elastomer sensors.